Calculation method for ground resultant electric field of DC transmission line

The invention relates to a calculation method for a ground resultant electric field of a DC transmission line. In the method, a practical transmission line is modeled by finite elements so as to calculate the ground resultant field of the DC transmission line, the in modeling process, the calculation accuracy for the electric field on a conductor surface is improved by a sub-domain; based on mathematical methods, the electric field with existence of space charge is calculated, and finally, the more accurate ground resultant field calculation method is obtained. The test data obtained from tests shows that the method of the invention has higher accuracy, and can be used for calculation of the DC resultant field of a high-voltage DC power line in the future.